Drill-operating holder



June 24, 1930. cs.v w. BERRY 1,755,362

DRILL OPERATING HOLDER Filed Sept. 4', 1928 Patented June 24, i

4ma'I flfo STATES 'PATENT ori-lcs 'anonce wf nanny, or woLrEvsono, ixwHAMPSHIRE DRILL-OPERATING HOLDER Application led September 4, 1928.Serial No. 303,854.

This invention relates fto'a drill holder adapted to be engaged with thedrill driving vmember of an electric drill press, such as is -commonlyused in automobilerepair shopsv and garages to operate a drill.

' It is 4often desirable to locate the drill at a considerable distance.from the driving' vrmember ogflthe drill press, and at various distances therefrom'. The object of'my invention Ais to rovide, as anadjunct or extension of a'dri 1 press,

a di'ilhholder osimple construction, adapted .to hold .a drill in axialalinement with' the driving .member ofthe press, and atany distance.therefrom thatmay be required by the nature of the work beingperformed.

part of this specificatiom- Figure 1 shows .partly in section and partlyin elevation a drill holder embodying. the

inventiomgraspingadrill of maximum ameter.,l

Figure 2 isa view similar to Figure 1, showing a bushing cooperatingwith the chuck Aes frs .45 of the inner section of t e jaws ofthe holderto grasp adrill of smaller diameter.

Figure 3 shows .perspective the inner section hereinafter described ofthe drill- `.holder shank. v Fi ure A shows .perspective 4the tubular umem r-hereinater described which includes the drllfgrasping jaws.

Figure yl5 shows in rspective an element of means ior closing t e jawslshown by Figure-4, on a drill. Fi' ure 6 is a ings own in section byFigure 2.

Figure 7 is an enlarged sectional View of the bushing member shown byFigure 6'.

40 lFigure 8 is an enlargement of'a portion of of bushings'.

Figure 1, showing. a seriasl line 9-9 b fFlg- Figure 9 is 'a sectiononure-B.v 1 ti E F' re 0 s ow's in' ve-a por ion 1g gill-holder shank'sion of the driving member of a drill press,

f 4the accompanying drawings forming aA having an. internal screw thread24, engaged ortion of theV vslotted tubular member, the s eeve having aperspectiveview of then .an outer section. com

press member,

member separately jof the inner section.

and a modification of the stepped end thereof.

Figure 11 showsin perspective a portion ofa drill formed to engage thestepped end shown by Figure 10. Figure 12 shows a series of drills ofdifferent diameters.

The same reference characters indicate the sameparts in all ofthefigures.

My improved holder constitutes an extenand is adapted to hold either ofa plurality of cylindrical drills 13,of .diil'erent diameters.

Said -holder includes a tubular member having longitudinal slots 21,extending :from its inner end throughoutthe major ortion of its length,to form drill-grasping c uck jaws 20, and provided with compressingmeans of well known character adapted to close the drill 13 insertedinthe boreof said jaws on a sald means `mcludlng a sleeve 23 member,

with an externally threaded tapered internal surface portion bearing onend .portions of the jaws 20. The outer end portion of the tubularmember is rigid and 1nternal1y screw-threaded, and constitutes anelongated coupling sleeve, with which are separably engaged externallythreaded portions of a two-part elongatedshank which is adapted at oneend to be grasped by the driv and 'at the other ing member of a drillpress, j D end to engage a drill '13 grasped by the jaws 20. Said shankincludes an innersection combody 16, and an enlarged"v .16, constitutingaj aged with the The shan vincludes also -osed of an elongated' eengaged by a drillsed of a reduced externally threaded endcouplingmember separably en coupling sleeve 19.

body 17, adaptedA to and -a reduced externally 17, constituting a'`coupling engagedwit the coupling sleeve 19, and separably abuttlng theend 16n hreaded end the outer end portions of.

The inner shank section has a stepped end adapted to have atorque-transmittin en-` gagement with the step ed end of a dri l 13.Said stepped ends may e variously formed. The inner shank section mayhave a stepped end 15, formed toengage a stepped end 14 on thedrill, asshown by Figures 1, 3 and 8, or a stepped end 15?, formed to engage astepped end 14* on the drill, as shown by Figures-10 and 11.

The reduced body 16 of the inner shank section is separated by anannular space from the internal surface of the slotted ortion of thetubular member, as shown by igures 1, 2 and 8, so that said reduced bodpermits the jaws 2O to be closed on drills o diiferent diameters.

The separability of the outer shank section from the coupling sleeve 19,and from the inner shank section, permits outer shank sections ofdilferent lengths to be used interchangeably, so that the length of theholder as a whole, may be varied to locate the drill 13 at any desireddistance from the driving member of a drill press..

The inner shank section is preferably provided with a peripheralenlargement 16b between the reduced body 16 and the threaded end 16,said enlargement bearing on the bore of the tubular member, as shown byFigure 1, to prevent looseness of the inner section,

which might be permitted by` the screwthread connection between the end16 and the coupling sleeve 19, if said enlargement were not provided.The inner section is therefore rigidly supported laterally. To provideadditional rigidity I provldevthe outer shank section with a 'bevelledperipheral face 17 b, bearing on a complemental internal face formed onthe sleeve 19, as shown -by Figure 1.

It will now be seen that the described holder is sim le, com act, andrigid, and well I adapted or use with the electric drill ress member tocooperate with the jaws in graspv ing drills whose diameters are smallerthanl those of drills `adapted to be grasped directly.

- by the jaws.

I have here shown a series of compressible tubular bushing members 28-of dilferent vd1- ameters. Each bushing is preferably a resilient sheetmetal tube divided longitudinally from end to endrby a slot 29 (Figures6 and 7) and partly divided by a slot V30. Two or c more of the bushingmembers maybe nested together to form a laminated tubular bushing whosewall thickness is determined by thenumber-of nested members. The largestbushing member conforms to the internal d 1- ameter of the compressiblesocket 20, andis adapted as shown by Figure 2 to engage a drill shankwhose diameter is less than that of a shank adapted to be engageddirectly f by the socket 20, as shown by Figure 1. The other bushingmembers are adapted to engage drill Shanks of other and smallerdiameters. -When all the bushing members are nested, as shown by Figure8, the laminated bushing formed thereby, is adapted to engage thesmallest drill shank.

Each bushing member 28 is rovided at its outer' end with a stop to limitits insertion in the compressible socket 20, the stop being preferablyan outwardly projecting flange 31.' The stop of the largest bushingmember is formed .to abut the outer member 23 of the chuck, and the stopof each of the other members is adapted to abut the stop of the nextlarger member as shown by Figure 8.

I claim':

1. A drill holder constituting a drill-press extension and adapted tohold either of a plurality of cylindrical drills of different diameters,said holder comprising a tubular member longitudinally slotted from itsinner end throughout the major portion of its length, toLform .chuckjaws, and provided with compressing means adapted to close said jaws ona cylindrical drill, the outer end portion of said member being rigidand internally screw-threaded to constitute an elongated couplingsleeve, and a sectional shank including an inner section composed of areduced body andA an enlarged externally threaded end constituting acoupling member separably engaged with said coupling sleeve, and anoutersection composed of an elongated body, adapted to be engaged by adrillpress member, and a reduced externally threaded end, constituting acoupling member separably engaged with the coupling sleeve, and separaly abutting the inner section, the inner shanksection having a steppedend adapted to engage the stepped end of4 a drill grasped by said jaws,the reduced body of the inner shank section permitting the -jaws to beclosed on cylindrical drills of different diameters, the separability ofthe outer section permitting outer sections of different lengths to beused interchan eably.

l2. A drill holder as speci ed by claim 1, the inner shank section beingprovided with a peripheralv enlargement between its reduced body andthreaded end, said enlargement bearing ou the internal surface of thetubular member.

3. A drill holder as specified by claim 1, the outer shank section.being provided with a bevelled' peripheral face bearing on acomplemental face formed on the coupling sleeve.

In testimony whereof I have aixed my signature.

GEORGE W. BERRY.

